CN210640748U - Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor - Google Patents
Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor Download PDFInfo
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- CN210640748U CN210640748U CN201921843009.3U CN201921843009U CN210640748U CN 210640748 U CN210640748 U CN 210640748U CN 201921843009 U CN201921843009 U CN 201921843009U CN 210640748 U CN210640748 U CN 210640748U
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- 230000005284 excitation Effects 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 112
- 239000010959 steel Substances 0.000 claims abstract description 112
- 230000005291 magnetic effect Effects 0.000 claims abstract description 111
- 239000000463 material Substances 0.000 claims description 115
- 229910001172 neodymium magnet Inorganic materials 0.000 claims description 32
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 claims description 28
- -1 aluminum nickel cobalt Chemical compound 0.000 claims description 5
- 238000004804 winding Methods 0.000 claims description 5
- 229910000976 Electrical steel Inorganic materials 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 230000002349 favourable effect Effects 0.000 abstract 1
- 229910000828 alnico Inorganic materials 0.000 description 37
- 230000005347 demagnetization Effects 0.000 description 22
- 230000000694 effects Effects 0.000 description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000005415 magnetization Effects 0.000 description 6
- 230000005389 magnetism Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 229910052761 rare earth metal Inorganic materials 0.000 description 4
- 150000002910 rare earth metals Chemical class 0.000 description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
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Abstract
The utility model provides a mixed excitation rotor and mixed excitation table pastes formula permanent-magnet machine, including the pivot, be fixed in the epaxial rotor core of pivot, rotor core outside circumference is provided with a plurality of rotor poles, is provided with air gap interval between the rotor pole, and each rotor pole has all included a plurality of arc magnet steels, just the arc magnet steel includes first magnet steel and second magnet steel two kinds, and the coercive force of first magnet steel has the same remanence or is close with the second magnet steel, but coercive force between them is different; and first magnet steel and second magnet steel set up in turn in proper order, the utility model discloses possible lower torque output cost still has simple structure simultaneously and is favorable to mill's mass production and does not influence the electromagnetic characteristic of motor and the weak magnetic control's of being convenient for characteristics.
Description
Technical Field
The utility model belongs to the technical field of permanent-magnet machine, concretely relates to mixed excitation rotor and mixed excitation surface-mounted permanent-magnet machine.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
The motor is an important component of modern industrial production and human life, and is also one of the national economic important thrusts. Rare earth materials are important scarce resources all the time in the world, and with the application of rare earth materials and the development of scientific technology, the types and the performances of permanent magnet materials are greatly improved. With the progress of the permanent magnet material, the permanent magnet motor is more and more widely applied to the fields of electric automobiles, household appliances, wind driven generators, aerospace, intelligent robots, medical appliances, agricultural production and the like. The ultra-high magnetic performance of the rare earth permanent magnet can reduce the weight of the motor by 30-50% compared with the weight of a conventional motor, and the power density of the motor is improved; the permanent magnet motor has high power factor, has obvious advantages in the aspects of the quick speed regulation characteristic, overload capacity and the like of the motor, and has the trend of obviously replacing an asynchronous motor. The surface-mounted permanent magnet motor is widely used in various occasions due to simple structure, high reliability, simple manufacturing process and easy vector control.
However, with the tension of rare earth materials and the continuous rising of prices, the research, development and development of surface-mounted permanent magnet motors are severely limited.
Disclosure of Invention
The utility model discloses a solve above-mentioned problem, provided a mix excitation rotor and mix excitation table and paste formula permanent-magnet machine, the utility model discloses can reduce torque output cost, improve the torque output of unit cost, still have simple structure simultaneously, do not influence the electromagnetic characteristic of motor and the weak magnetic control's of being convenient for characteristics.
According to some embodiments, the utility model adopts the following technical scheme:
a mixed excitation rotor comprises a rotating shaft and a rotor core fixed on the rotating shaft, wherein a plurality of rotor poles are arranged on the circumference of the outer side of the rotor core, air gap intervals are arranged between the rotor poles, each rotor pole comprises two arc-shaped magnetic steels, each arc-shaped magnetic steel comprises a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel have the same or similar remanence, but the coercive forces of the first magnetic steel and the second magnetic steel are different;
and the first magnetic steel and the second magnetic steel are sequentially and alternately arranged.
The above scheme makes full use of the magnetomotive force generated by the stator current to reduce the cost on the permanent magnet. The purpose of reducing the cost of the motor is achieved by using a permanent magnet with low coercive force such as alnico and the like in a magnetism assisting area generated by the stator, and the torque output of the motor is ensured by using a permanent magnet with high coercive force such as neodymium iron boron and the like in a demagnetization area generated by the stator.
The direction of the magnetomotive force generated by the current is the same as the magnetizing direction of the permanent magnet material, a certain magnetizing or magnetizing assisting effect can be generated on the permanent magnet material, the magnetizing or magnetizing assisting effect depends on the coercive force of the permanent magnet material, the permanent magnet material with smaller coercive force is easier to be magnetized or easier to be highlighted, the magnetizing effect of the magnetomotive force generated by the magnetizing current is generated, the permanent magnet material with larger coercive force is harder to be magnetized or harder to be highlighted, the magnetizing effect of the magnetomotive force is generated, when the magnetizing direction of the permanent magnet material is opposite to the direction of the magnetomotive force generated by the current, the permanent magnet material has a demagnetization risk, the demagnetization condition still depends on the coercive force of the permanent magnet material, the demagnetization effect of the permanent magnet material with larger coercive force is smaller, and the demagnetization effect of the permanent magnet material with smaller coercive force is larger. In the steady-state operation process of the motor, if all the second magnetic steels are in the magnetizing or magnetizing state all the time, the contribution degree of the second magnetic steels to the torque can be well improved, so that the torque of the motor is improved, the torque cost of the motor is reduced, and the aim of outputting the torque at higher unit cost is fulfilled.
As an alternative embodiment, the first magnetic steel is a magnetic steel made of neodymium iron boron material, and the second magnetic steel is a magnetic steel made of alnico material.
As an alternative embodiment, the first magnetic steel and the second magnetic steel are closely adhered to the rotor core, and no air gap is formed.
As an alternative embodiment, the magnetizing directions of two different magnetic steels of the same rotor pole are the same, and the magnetizing direction of each magnetic steel is radial magnetizing.
Alternatively, two adjacent rotor poles are oppositely charged, i.e., radially inward and radially outward.
As an alternative embodiment, the second magnetic steel corresponds to an electrical angle α between 55 ° and 75 °, and the first magnetic steel corresponds to an electrical angle β between 75 ° and 55 °.
As an alternative embodiment, the electric angle α corresponding to the second magnetic steel is 75 °, and the electric angle β corresponding to the first magnetic steel is 55 °, in the process of arranging the magnetic poles of the motor, the purpose of reducing the torque cost can be achieved by keeping α + β at 130 °, α at 55 ° to 75 °, and corresponding β at 75 ° to 55 °.
As an alternative, the air gap spacing on the second magnet steel side corresponds to the electrical angle δ120 degrees, the air gap on the first magnetic steel side is separated by a corresponding electrical angle delta2＝30°。
As an alternative embodiment, the remanence corresponding to the first magnetic steel and the remanence corresponding to the second magnetic steel should be equal as much as possible, and the error is less than 0.01T. Under the condition that the residual magnetism meets the condition, the coercive force corresponding to the first magnetic steel is 10-20 times of the coercive force corresponding to the second magnetic steel, the configuration can reduce the cost of the permanent magnet and the cost of the torque, and the aim of increasing the torque under the unit cost is fulfilled.
A mixed excitation surface-mounted permanent magnet motor comprises the mixed excitation rotor and a stator.
As an alternative embodiment, the magnetomotive force generated by the stator current is always in a magnetizing state for the second magnetic steel, that is, the second magnetic steel is always in the area of the magnetizing area generated by the stator current magnetomotive force (the magnetomotive force generated by the stator current has the same direction as the magnetizing direction of the magnetic steel), so that the second magnetic steel is always arranged in front of the first magnetic steel in each pole of the rotor along the stator current magnetomotive force rotating direction.
As an alternative embodiment, the stator has a stator core having a structure in which electromagnetic silicon steel sheets are laminated in the direction of the rotation axis, and a plurality of stator windings, and the stator core has a cylindrical shape and extends in the direction of the rotation axis.
Compared with the prior art, the beneficial effects of the utility model are that:
the utility model provides a mixed excitation surface-mounted permanent magnet motor can accomplish lower torque output cost in the same kind of specification and dimension surface-mounted permanent magnet motor, improves the torque output of unit cost. Meanwhile, the motor has the characteristics of simple structure, contribution to batch production in factories, no influence on the electromagnetic property of the motor and convenience for weak magnetic control.
The utility model discloses utilize neodymium iron boron material and alnico material to have the same or similar remanence, coercive force has the characteristics of great difference, the motor is at steady state operation in-process, control keeps the contained angle between stator magnetomotive force and the rotor magnetomotive force to be 90 (electric angle) all the time, used alnico permanent magnet material is all in all the time and magnetizes or helps under the magnetism state, improvement alnico permanent magnet material that can be fine is to the contribution degree of torque, when reducing the permanent magnet cost, reduce the torque loss, thereby realize the higher purpose of output torque under the unit cost.
Drawings
The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the invention without unduly limiting the scope of the invention.
Fig. 1 is a schematic sectional view of a motor according to the present embodiment;
FIG. 2 is a sectional structural view of one rotor pole of the present embodiment;
fig. 3 is a schematic diagram of demagnetization curves of the ndfeb material and the alnico material according to the embodiment;
FIG. 4 is a schematic diagram of magnetomotive force generated by stator current and tensile force and thrust force generated by permanent magnet material distribution on a rotor in an electrical cycle of the present embodiment, and is also a schematic diagram of the whole motor design;
fig. 5 is a 3D structural view of the 4-pole rotor of the present embodiment.
The specific implementation mode is as follows:
the present invention will be further explained with reference to the accompanying drawings and examples.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments in accordance with the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, the terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, and are only the terms determined for convenience of describing the structural relationship of each component or element of the present invention, and are not specific to any component or element of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and may be fixedly connected, or may be integrally connected or detachably connected; may be directly connected or indirectly connected through an intermediate. The meaning of the above terms in the present invention can be determined according to specific situations by persons skilled in the art, and should not be construed as limiting the present invention.
The embodiment provides a surface-mounted permanent magnet rotor with high-performance hybrid excitation, so that a surface-mounted permanent magnet motor with low torque cost is realized. The low torque cost means that under the condition of ensuring that the material size structure and the manufacturing process of the motor stator and rotor core are the same, the price required by changing the composition and the configuration angle of the rotor permanent magnet material to generate unit torque on the permanent magnet material is the lowest, and the unit cost can be considered to generate larger torque.
The first embodiment will be described by taking a 27-slot 4-pole hybrid excitation surface-mount permanent magnet motor with high performance and low torque cost as an example, as shown in fig. 1. However, the 4-pole motor rotor is taken as an example for explanation, but the number of poles of the rotor structure is not limited to 4. Other stator structures with grooves and the number of the grooves and other winding modes can be adopted, and the torque performance characteristics of the stator can not be influenced. The number of rotor poles can be increased but it is necessary to ensure that each pole of the rotor is the same as the arrangement described below.
In this embodiment, a 27 slot stator uses distributed winding routing for the purpose of reducing torque ripple.
Fig. 1 is a cross-sectional view perpendicular to the direction of the rotation shaft of the high-performance low-torque-cost hybrid excitation surface-mounted permanent magnet motor according to the first embodiment. Fig. 2 is a sectional view of one pole of the high-performance low-torque-cost hybrid excitation surface-mount permanent magnet motor rotor according to the first embodiment, the sectional view being perpendicular to the rotation axis, and fig. 2 is 1/4 of the sectional view, and only 1/4 is shown for convenience of explanation, but the high-performance low-torque-cost hybrid excitation surface-mount permanent magnet motor rotor is not limited to four parts.
The high-performance low-torque cost hybrid excitation surface-mounted permanent magnet motor is provided with a stator (1) and a rotor (4) inside a shell.
The stator (1) has a stator core (2) and a plurality of stator windings (3).
The stator core (2) has a structure in which electromagnetic silicon steel sheets, which are thin plates made by adding silicon to iron in order to reduce eddy current loss, are laminated in the direction of the rotation axis. The stator core (2) is cylindrical and extends in the direction of the rotation axis (8).
Fig. 2 shows a single pole structure of the rotor (4). The rotor core (7) has a structure in which electromagnetic silicon steel sheets are laminated in the direction of the rotation axis. Tile-shaped magnetic steel (5) made of an alnico material and tile-shaped magnetic steel (6) made of an NdFeB material are respectively fixed on the outer side surface of the rotor core (7) and are tightly adhered to the rotor core (7) without air gaps. Arc formed by tile-shaped magnetic steel (5) made of alnico materialThe corresponding central angle α is 75 electrical degrees, the central angle β corresponding to the arc formed by the tile-shaped magnetic steel (6) made of the neodymium iron boron material is 55 electrical degrees, meanwhile, the tile-shaped magnetic steel made of the two materials is tightly arranged on the outer surface of the rotor iron core (7), no air gap interval exists in the middle, no air gap interval exists between the tile-shaped magnetic steel (5) made of the aluminum nickel cobalt material and the tile-shaped magnetic steel (6) made of the neodymium iron boron material, and the radian delta corresponding to the air gap interval does not exist between the tile-shaped magnetic steel (5) made of the aluminum nickel cobalt material and the tile-shaped magnetic steel (6120 ° electrical angle. The tile-shaped magnetic steel (6) made of neodymium iron boron material has no air space with the side close to the tile-shaped magnetic steel (5) made of alnico material, and the radian delta corresponding to the air gap space230 ° electrical angle. The tile-shaped magnetic steel (5) made of the alnico material and the tile-shaped magnetic steel (6) made of the neodymium iron boron material of the same rotor pole have the same magnetizing directions and are magnetized along the radial direction, the magnetizing directions are inwards or outwards along the radial direction, and the tile-shaped magnetic steel (5) made of the alnico material and the tile-shaped magnetic steel (6) made of the neodymium iron boron material of two adjacent rotor poles are opposite in magnetizing direction.
The surface-mounted permanent magnet on the rotor is composed of two permanent magnet materials with large price difference but same remanence and different coercive forces, and the permanent magnet material with low price has the smaller coercive force and the coercive force of the permanent magnet material with high price is different by 10-20 times. The low coercive force permanent magnet is selected for two reasons, 1) the price of the low coercive force permanent magnet is much lower under the condition of the same remanence, and the torque cost is favorably reduced. 2) The permanent magnet with low coercive force is easy to be magnetized by current, is greatly influenced by magnetomotive force generated by the current, and can play a role in assisting magnetism of a permanent magnet material under the condition that the magnetizing direction is the same as the magnetomotive force generated by the current, so that the contribution degree of the permanent magnet material to the torque is increased. The permanent magnet material with large coercive force is less influenced by the magnetomotive force generated by current. Magnetomotive force generated by stator current has a demagnetization effect and an auxiliary magnetization effect on magnetic steel installed on a rotor respectively, and a low-coercivity permanent magnet material in an auxiliary magnetization state is used for replacing an expensive high-coercivity permanent magnet material, so that the manufacturing cost of the motor is greatly reduced, but the output torque of the motor is only slightly reduced. The number of rotor poles can be increased but it is necessary to ensure that each pole of the rotor is the same as the arrangement described below.
Fig. 3 is a schematic diagram of demagnetization curves of the neodymium-iron-boron material and the alnico, in which the dotted line is the demagnetization curve of the neodymium-iron-boron material, the solid line is the demagnetization curve of the alnico material, the two have the same or similar remanence, but the coercivity of the neodymium-iron-boron material is much larger than that of the alnico material.
Each pole of the rotor is respectively composed of tile-shaped magnetic steel made of neodymium iron boron materials and tile-shaped magnetic steel made of aluminum nickel cobalt materials, wherein the neodymium iron boron materials and the aluminum nickel cobalt materials have the same or similar residual magnetism, and the coercive force has larger difference. The coercive force of the neodymium iron boron material is far higher than that of the alnico material, so the neodymium iron boron material has strong demagnetization resistance, the coercive force of the alnico material is far lower than that of the neodymium iron boron material, so the alnico material has the risk of demagnetization, but the alnico material is also easily magnetized and assisted by magnetomotive force generated by current, and the alnico material under the magnetizing or assisting action has higher contribution degree to torque, namely generates higher torque. The direction of magnetomotive force generated by current is the same as the magnetizing direction of the permanent magnet material, certain magnetization or magnetization assisting can be generated on the permanent magnet material, the magnetization or magnetization assisting effect of the permanent magnet material depends on the coercive force of the permanent magnet material, the permanent magnet material with smaller coercive force is easier to be magnetized or easier to be highlighted, the permanent magnet material with larger coercive force is harder to be magnetized or harder to be highlighted, when the magnetizing direction of the permanent magnet material is opposite to the direction of magnetomotive force generated by current, the permanent magnet material has demagnetization risk, the demagnetization condition of the permanent magnet material still depends on the coercive force of the permanent magnet material, the permanent magnet material with larger coercive force has smaller demagnetization effect, and the permanent magnet material with small coercive force has larger demagnetization effect.
In the steady-state operation process of the motor, if all the used alnico permanent magnet materials are always in a magnetizing or magnetizing state, the contribution degree of the alnico permanent magnet materials to the torque can be well improved, so that the aims of outputting higher torque at unit cost and reducing the torque cost of the motor are fulfilled.
Fig. 4 is a schematic diagram of the tile-shaped magnetic steel made of different permanent magnet materials on the surface of the rotor and generating magnetomotive force by stator current in an electrical cycle, and only shows the relative position of the tile-shaped magnetic steel made of different permanent magnet materials and the magnetomotive force generated by stator current.
In the configuration process, the included angle between the stator magnetomotive force and the rotor magnetomotive force is always 90 degrees (electrical angle), in order to ensure that the output torque of the motor per unit cost is higher, the magnetomotive force generated by the stator current is always in a magnetizing state on the AlNiCo permanent magnet material, namely, the AlNiCo material is always in the area of a magnetizing area generated by the stator current magnetomotive force, so that in each pole of the rotor, the AlNiCo material is always arranged in front of the NdFeB permanent magnet material along the rotating direction of the stator current magnetomotive force. The neodymium iron boron material is not easy to demagnetize or magnetize due to the large coercive force, so that the neodymium iron boron material can be positioned in a region where the stator current magnetomotive force generates demagnetization. The price of the neodymium iron boron raw material in the market is about one time of that of the alnico raw material (on the premise of the same remanence).
The motor well combines the characteristics of two permanent magnet materials, makes full use of the influence of stator current magnetomotive force, greatly reduces the use cost of the permanent magnet materials of the motor, and simultaneously reduces the loss of torque as much as possible, thereby greatly reducing the cost of the torque and improving the output torque of unit cost. The magnetizing directions of the tile-shaped magnetic steels made of two different materials of each pole of the rotor are the same, the magnetizing direction of each tile-shaped magnetic steel is radial magnetizing, the magnetizing directions of two adjacent rotor poles are opposite, and the two adjacent rotor poles are respectively magnetized inwards along the radial direction and outwards along the radial direction. An air gap with a certain electric angle is reserved between each pole of the rotor for saving the permanent magnet and reducing the flux leakage between poles.
FIG. 2 is a cross-sectional structure diagram of a rotor pole of a 27-slot 4-pole hybrid excitation surface-mount permanent magnet motor with high performance and low torque cost, wherein an electrical angle α corresponding to tile-shaped magnetic steel (5) made of AlNiCo material is 75 degrees, an electrical angle β corresponding to tile-shaped magnetic steel (6) made of NdFeB material is 55 degrees, the tile-shaped magnetic steels made of the two materials are closely arranged on the outer surface of a rotor core (7), no air gap interval exists in the middle, and the air gap interval is arranged on the tile-shaped magnetic steel (5) side made of the AlNiCo materialElectric angle delta corresponding to air gap interval1The electric angle delta corresponding to the air gap interval at the tile-shaped magnetic steel (6) side made of 20-degree neodymium iron boron material2＝30°。
FIG. 3 is a schematic diagram of demagnetization curves of Nd-Fe-B material and AlNiCo material; wherein, the dotted line represents the demagnetization curve of the neodymium iron boron material, and the solid line represents the demagnetization curve of the alnico material. Two curves having similar remanence, i.e. B of the two curvesrThe coercivities of the two curves are the same or similar, and the coercivities of the two curves have a large difference, namely the pattern HcAnd Hc1The phase difference is large.
Fig. 4 is a schematic diagram of magnetomotive force generated by stator current in one electrical cycle of the high-performance low-torque cost hybrid excitation surface-mounted motor and pulling force and pushing force generated by permanent magnet material distribution on a rotor. The magnetomotive force direction generated by the stator current moves from right to left, wherein the magnetizing direction of the first magnetic steel (made of the AlNiCo permanent magnet material) on the left side is the same as the magnetomotive force direction generated by the stator current, the stator current magnetomotive force has a magnetizing or magnetizing effect on the magnetic steel (made of the AlNiCo permanent magnet material), the contribution degree of the AlNiCo material to torque components can be improved, and the magnetic steel (made of the AlNiCo permanent magnet material) is pushed to move left by the stator current magnetomotive force. The magnetizing direction of the second magnetic steel (made of neodymium iron boron permanent magnet materials) on the left side is opposite to the magnetomotive force direction generated by the stator current, the magnetic steel (made of neodymium iron boron permanent magnet materials) has the demagnetization risk and is not assisted by the magnetic effect, and the stator current magnetomotive force pulls the magnetic steel (made of neodymium iron boron permanent magnet materials) to move leftwards. The magnetizing direction of the third piece of magnetic steel (made of the alnico permanent magnet material) on the left side is the same as the magnetomotive force direction generated by the stator current, the stator current has the magnetizing or magnetizing effect on the magnetic steel (made of the alnico permanent magnet material), the contribution degree of the alnico material to the torque component can be improved, and the stator current magnetomotive force pushes the magnetic steel (made of the alnico permanent magnet material) to move left. The magnetizing direction of the fourth magnetic steel (made of neodymium iron boron permanent magnet materials) on the left side is opposite to the magnetomotive force direction generated by the stator current, the magnetic steel (made of neodymium iron boron permanent magnet materials) has the demagnetization risk and is not assisted by the magnetic effect, and the stator current magnetomotive force pulls the magnetic steel (made of neodymium iron boron permanent magnet materials) to move leftwards.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Although the present invention has been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without inventive work are still within the scope of the present invention.
Claims (10)
1. A hybrid excitation rotor is characterized in that: the magnetic rotor comprises a rotating shaft and a rotor core fixed on the rotating shaft, wherein a plurality of rotor poles are arranged on the periphery of the outer side of the rotor core, air gap intervals are arranged between the rotor poles, each rotor pole comprises a plurality of arc-shaped magnetic steels, each arc-shaped magnetic steel comprises a first magnetic steel and a second magnetic steel, the first magnetic steel and the second magnetic steel have the same or similar remanence, but the coercive forces of the first magnetic steel and the second magnetic steel are different;
and the first magnetic steel and the second magnetic steel are sequentially and alternately arranged.
2. A hybrid rotor as defined in claim 1, wherein: the first magnetic steel is made of neodymium iron boron materials, and the second magnetic steel is made of aluminum nickel cobalt materials.
3. A hybrid rotor as defined in claim 1, wherein: the first magnetic steel and the second magnetic steel are closely adhered to the rotor core, and no air gap exists.
4. A hybrid rotor as defined in claim 1, wherein: the magnetizing directions of two different magnetic steels of the same rotor pole are the same, and the magnetizing direction of each magnetic steel is radial magnetizing.
5. A hybrid rotor as defined in claim 1, wherein: the magnetizing directions of two adjacent rotor poles are opposite, and the two adjacent rotor poles are respectively magnetized inwards along the radial direction and outwards along the radial direction.
6. The hybrid excitation rotor as claimed in claim 1, wherein, as an alternative embodiment, the second magnetic steel corresponds to an electrical angle α of 55 ° to 75 °, and the first magnetic steel corresponds to an electrical angle β of 75 ° to 55 °;
or the electrical angle α corresponding to the second magnetic steel is 75 degrees, and the electrical angle β corresponding to the first magnetic steel is 55 degrees.
7. A hybrid rotor as defined in claim 1, wherein: the electrical angle delta corresponding to the air gap interval on the second magnetic steel side120 degrees, the air gap on the first magnetic steel side is separated by a corresponding electrical angle delta2＝30°；
Or the remanence corresponding to the first magnetic steel and the remanence corresponding to the second magnetic steel are equal as much as possible, and the error is less than 0.01T;
or, under the condition that the remanence meets the condition, the coercive force corresponding to the first magnetic steel is 10-20 times of the coercive force corresponding to the second magnetic steel.
8. Hybrid excitation surface-mounted permanent magnet motor, characterized by: comprising a hybrid excited rotor and stator as claimed in any one of claims 1-7.
9. The hybrid excitation surface-mount permanent magnet motor according to claim 8, wherein: under the condition that the included angle between the stator magnetomotive force and the rotor magnetomotive force is kept to be 90 degrees all the time, the magnetomotive force generated by the stator current is in a magnetizing state all the time for the second magnetic steel with low coercive force, namely the second magnetic steel is always located in a magnetizing area generated by the stator current magnetomotive force, so that in each pole of the rotor, the second magnetic steel is always arranged in front of the first magnetic steel with high coercive force along the rotating direction of the stator current magnetomotive force.
10. The hybrid excitation surface-mount permanent magnet motor according to claim 8, wherein: the stator has stator core and a plurality of stator winding, stator core has the structure that the range upon range of electromagnetic silicon steel sheet formed in the pivot direction, and stator core is cylindric, and extends in the pivot direction.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201921843009.3U CN210640748U (en) | 2019-10-28 | 2019-10-28 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
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| CN201921843009.3U CN210640748U (en) | 2019-10-28 | 2019-10-28 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
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| CN201921843009.3U Withdrawn - After Issue CN210640748U (en) | 2019-10-28 | 2019-10-28 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
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| Country | Link |
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| CN (1) | CN210640748U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649732A (en) * | 2019-10-28 | 2020-01-03 | 山东大学 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
| CN115001179A (en) * | 2022-08-04 | 2022-09-02 | 东南大学 | Permanent magnet block type harmonic memory motor |
-
2019
- 2019-10-28 CN CN201921843009.3U patent/CN210640748U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110649732A (en) * | 2019-10-28 | 2020-01-03 | 山东大学 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
| CN110649732B (en) * | 2019-10-28 | 2024-02-23 | 山东大学 | Mixed excitation rotor and mixed excitation surface-mounted permanent magnet motor |
| CN115001179A (en) * | 2022-08-04 | 2022-09-02 | 东南大学 | Permanent magnet block type harmonic memory motor |
| CN115001179B (en) * | 2022-08-04 | 2022-10-28 | 东南大学 | Permanent magnet block type harmonic memory motor |
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